package javaIO;

import java.io.*;

class Blip1 implements Externalizable {
    public Blip1(){
        System.out.println("Blip1 Constructor");
    }

    @Override
    public void writeExternal(ObjectOutput out) throws IOException {
        System.out.println("Blip1.writeExternal");
    }

    @Override
    public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
        System.out.println("Blip1.readExternal");
    }
}

class Blip2 implements Externalizable{
    Blip2(){
        System.out.println("Blip2 Constructor");
    }

    @Override
    public void writeExternal(ObjectOutput out) throws IOException {
        System.out.println("Blip2.writeExternal");
    }

    @Override
    public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
        System.out.println("Blip2.readExternal");
    }
}

public class Blips{
    public static void main(String[] args) throws IOException,ClassNotFoundException{
        System.out.println("Constructing objects");
        Blip1 b1 = new Blip1();
        Blip2 b2 = new Blip2();

        ObjectOutputStream o = new ObjectOutputStream(
                new FileOutputStream("Blips.out")
        );
        System.out.println("Saving objects");

        o.writeObject(b1);
        o.writeObject(b2);
        o.close();

        ObjectInputStream in = new ObjectInputStream(new FileInputStream("Blips.out"));
        System.out.println("Recovering b1:");
        b1=(Blip1)in.readObject();
        //Because the Blip2's Constructor is non-public ,so there will be throwing an Exception of Invalid Constructor
//        System.out.println("Recovering b2:");
//        b2 =(Blip2)in.readObject();
    }
}
